(law) A person or group of people constituting a particular side in a contract or legal action. / (slang, dated) A person; an individual. / With to: an accessory, someone who takes part.

(intransitive) To celebrate at a party, to have fun, to enjoy oneself. / (intransitive, slang, euphemistic) To take recreational drugs.

Of a fence or wall: shared by two properties and serving to divide them. / (obsolete, except in compounds) Divided; in part.

(idiomatic) Privy to; having knowledge of.

present participle of party

(neologism, derogatory) The Republican Party of the United States.

(Internet, historical) An informal private party held as part of a convention, giving Internet users the chance to meet in person.

(cryptography) Synonym of Alice (“placeholder”)

(law) An award granted by a court in a legal proceeding to one party requiring another party to pay an amount of the first party's legal costs, excluding lawyer fees.

The basic, central, or main concept, drawing, or scheme of an architectural design. / (dated) Someone (especially a man) who is considered to be a good choice for marriage, because of wealth, status etc.